Some of them are created using visual studio 2010. I guess you have a more recent version (2012-2013). The program should ask you to upgrade to your version when you open the code. On the other hand, if you have vs 2010 you can't open the projects made in the 2012-2013 one. The best you can do is download the latest version on the visual studio.

_________________“Always code as if the guy who ends up maintaining your code will be a violent psychopath who knows where you live.”

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